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Coach is right about my poor choice of words. TJ should be able to set the regulator at the desired lower pressure for the tires and send it out. Once the the tires air down to the same pressure as the incoming air they will stop deflating, but the wheel valves won't close until the ingoing...

I took apart a wheel valve and figured out how it works. Even if the tire is inflated to highway pressure, a lower pressure applied through the line will actually deflate the tire, just like suprman says. The wheel valve gives the incoming air more leverage than the air in the tire, so low...